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AS1302 Fiches technique(PDF) 11 Page - ams AG

No de pièce AS1302
Description  5V/30mA Adaptive Inductorless Boost Converter
PDF  18 Pages
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Fabricant  AMSCO [ams AG]
Site Internet  http://www.ams.com
Logo AMSCO - ams AG

AS1302 Fiches technique(HTML) 11 Page - ams AG

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Revision 1.02
11 - 18
AS1302
Datasheet - D e t a i l e d D e s c r i p t i o n
Switch Configuration
The AS1302 has nine built-in power switches in the shape of two coupled H-bridge topologies. The system features
1:2 and 2:3 operation modes as well as a 1:1 operation where the input is directly connected to the output.
In 2:3 operation mode two flying capacitors are placed in series and each capacitor is charged to the half of the input
voltage. In pumping phase the flying capacitors are placed in parallel. The bottom-plates of the parallel flying
capacitors CFLY1 and CFLY2 are connected to the input voltage so that the voltage at the top-plates of the flying
capacitors is boosted to a voltage equal to VBATT + VBATT/2. By connecting the top-plates of the capacitors to the
output, the output voltage in the 2:3 mode can be up to one and a half of VBATT. If the top-plate voltage is higher than
5V, the regulation loop adapts the power transistor’s on-resistance to drop some voltage.
In 1:2 operation both flying capacitors are placed in parallel to the input voltage, and therefore charged to the input
voltage. During pumping phase the input voltage is connected to the bottom of the charged flying capacitors. The
voltage at the top-plates of the parallel capacitors is now boosted to 2VBATT. By connecting the top-plates of the
capacitors to the output, the output can be charged to twice the voltage of VBATT. If the top-plate voltage is higher than
5V the regulation loop limits the charge transfer to the output.
Figure 33. 2:3 Operating Mode
VBATT
+2.9V to 5.15V
SW1
CFLY1
CFLY2
SW3
SW2
SW4
Charging Phase
VOUT
+5V
VBATT
+2.9V to 5.15V
SW1
CFLY1
CFLY2
SW3
SW2
SW4
Pumping Phase
VOUT
+5V
Figure 34. 1:2 Operating Mode
VBATT
+2.9V to 5.15V
SW1
CFLY1
CFLY2
SW3
SW2
SW4
VOUT
+5V
Charging Phase
VBATT
+2.9V to 5.15V
SW1
CFLY1
CFLY2
SW3
SW2
SW4
Pumping Phase
VOUT
+5V



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